Tris[(R)-lactamide-κ²O,O′]zinc(II) tetrabromozincate

Abstract

The title compound, tris[(R)-2-hydroxypropanamide-kappa2O,O']zinc(II) tetrabromozincate, [Zn(C3H7NO2)3][ZnBr4], contains one monomeric six-coordinate zinc complex cation and one tetrahedral [ZnBr4]2- anion. Both Zn(II) atoms lie on threefold axes. Coordination in the cation occurs via the amide and hydroxy O atoms [Zn-O = 2.074 (5) and 2.073 (6) A] and has a distorted octahedral geometry, with cis-O-Zn-O angles in the range 76.2 (2)-109.2 (2) degrees . In the crystal structure, the cations and anions are linked by N-H...Br and O-H...O hydrogen bonds, generating a three-dimensional network.

Bis[(R)-lactamido-κ2O,O′]boron(III) bromide

“…In the same way, the two B-O (oxide) distances are similar [average 1.415 (7) Å ]; this difference can be explained by the ionic character of the B-O2 and B-O5 bonds. Among the two possible coordination modes (N,O or O,O) in metal complexes with lactamide or its derivatives described in the literature, the title compound presents an O,O mode like that described in the [Zn(lactamide) 3 ] 2+ cation (Bekaert et al, 2005).…”

“…Following our work on metal-amide crystalline complexes (Bekaert et al, 2002a(Bekaert et al, ,b, 2003, we recently reported a new zinc complex with 2-hydroxypropanamide (lactamide), a bidentate ligand (Bekaert et al, 2005). In the [Zn(lactamide) 3 ] 2+ cation, the Zn atom, coordinated in a bidentate fashion via amide and oxide atoms O of each ligand, presents similar Zn-O bond lengths [2.074 (6) Å ].…”

Dichloridobis[(S)-2-hydroxypropionamide-κ2O,O′]manganese(II)

“…For related literature, see: Bekaert et al (2005Bekaert et al ( , 2007; Chen et al (2006); Girma et al (2005). Table 1 Hydrogen-bond geometry (Å , ).…”

Tetrakis[(R)-lactamide-κ2 O,O′]strontium(II) dibromide

“…The crystal structure of tetra[(R)-lactamide-2 O,O 0 ]strontium(II) dibromide was compared with bis[(R)-lactamido-2 O,O 0 ]boron(III) bromide (Bekaert et al, 2007) and tris[(R)-lactamido-2 O,O 0 ]zinc (II) tetrabromozincate(II) (Bekaert et al, 2005).…”

“…All these values can be compared to those found in the poly[[tetaaquatris(monomethyl fumarato)distrontium(II)]monomethyl fumarate] in which the Sr atom is octa-coordinated by oxygen atoms which range from 2.499 (2) to 2.812 (2)Å (Stahl et al, 2006). Among the two possible coordination modes (N,O or O,O) in metal complexes with lactamide or its derivatives described in the literature, the title compound presents the O,O mode like those in the complexes with the [Zn(lactamide) 3 ] 2+ (Bekaert et al, 2005) or the [B(lactamide) 2 ] + (Bekaert et al, 2007) cations.…”